2006 stumpjumper fsr s-works value

Hello, I am thinking about selling my S-works frame. It is a large with the black anodizing. Has the brain shock. In very good shape. I have a friend that is in love with it and wants to buy it. I am not really sure what I should charge him. I would like to give him a buddy deal but don't want to give it away either. I have been searching ebay but have not seen many listed. Just a ball park value would be appreciated, I'll adjust the price down a bit for the buddy deal.

If he does not buy it I will list it in the classifieds, this is not an attempt at selling it without paying the listing fee.